TODAY OCT09
TEMPERATURE63
HUMIDITY84
PRESSURE101490
WIND COND.
  • 7763Thu
  • 7663Fri
  • 7760Sat
  • 7159Sun
  • 6959
daynightWeather update from San Diego, Brown Field Municipal Airport at
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Weather Quick Facts

  • The highest monthly average temperature in San Ysidro for August is 71.1 degrees
  • The lowest monthly average temperature in San Ysidro for December is 57.5 degrees
  • The most monthly precipitation in San Ysidro occurs in December with 2.2 inches
  • The air quality index in San Ysidro is 52% worse than the national average
  • The pollution index in San Ysidro is 1581% worse than the national average

Compare San Diego, CA Weather

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      San Ysidro Average Temperature

      In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
      MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
      January49°F68°F58°F1.7"
      February51°F68°F59°F1.8"
      March54°F69°F60°F1.0"
      April56°F70°F62°F0.6"
      May60°F70°F64°F0.4"
      June62°F72°F66°F0.0"
      July66°F76°F70°F0.2"
      August67°F78°F71°F0.0"
      September66°F78°F71°F0.2"
      October61°F77°F68°F0.5"
      November55°F73°F63°F0.9"
      December49°F67°F58°F2.2"

      San Ysidro air quality index & pollution index

      In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
      IndexSan YsidroSan DiegoCalifornia
      Air quality index646455
      Pollution index45,820,50045,820,50010,473,190

      San Ysidro air quality

      MeasurementTotal
      Days measured365
      Days with good air quality87
      Days with moderate air quality253
      Days w/ poor A.Q. for sensitive groups23
      Days with unhealthy air quality2

      Air quality details

      PollutantTotal
      Arsenic1.130%
      Benzene0.410%
      Carbon Tetrachloride0.030%
      Lead0.600%
      Mercury0.080%

      Average monthly San Ysidro temperature with heat index

      San Ysidro monthly precipitation with daily maximum

      San Ysidro monthly snow depth with daily maximum

      San Ysidro monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Coronado, CA24,5266428.0%
      Lemon Grove, CA26,7396428.0%
      Casa de Oro-Mount Helix, CA19,3276428.0%
      Imperial Beach, CA27,3346428.0%
      National City, CA61,3426428.0%
      San Diego, CA1,414,5456428.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Calgary, AB1,371,990n/a 
      Dallas, TX1,338,846512.0%
      San Antonio, TX1,529,133492.0%
      Philadelphia, PA1,581,531512.0%
      Phoenix, AZ1,658,4227448.0%
      San Diego, CA1,414,5456428.0%
      Source: The San Ysidro, San Diego, CA weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.